Alpine PDX-V9

[caraudioguy2100]

Has anyone ever worked on this amp ?

The light is solid red indicating a short circuit or overheated or possible power supply voltage is to high .

I opened the amp and check the outputs and power supply fets but nothing shorted ,

Anyone have any ideas on this amp ?

 

[caraudioguy2100]

Here is what I get on the 494

Pin 1:0.26
Pin 2:4.54
Pin 3:0.01
Pin 4:3.60
Pin 5:1.53
Pin 6:3.40
Pin 7:0.00
Pin 8:0.00
Pin 9:0.00
Pin 10:0.00
Pin 11:0.00
Pin 12:11.95
Pin 13:0.00
Pin 14:0.00
Pin 15:0.00
Pin 16:0.00

 

[Perry Babin]

Do you see a pulse of DC on any of the speaker terminals (check positive and negative) as the amp tries to power up?

Have you found a service manual for it?

 

[caraudioguy2100]

I see a pulse of DC on all of The channels as it tries to power up (4 volts )

I haven’t gotten the service manual for it yet .

 

[Perry Babin]

Do you see the same thing on the positive and the negative speaker terminals?

Scope or multimeter?

 

[caraudioguy2100]

Multimeter and I see it on both the positive and negative speaker terminals

 

[Perry Babin]

Test again but connect a speaker to one channel at a time and power up to see if one channel makes a slight tick/pop.

 

[caraudioguy2100]

All 4 channels make a pop when trying to power it up .

Only channel that doesn’t have a pop is the sub channel

 

[Perry Babin]

Does it appear that both the positive and negative rail and regulated voltages are trying to build voltage?

 

[caraudioguy2100]

It’s trying to build both rail and regulated voltages as it tries powering up it gets to about 5 volts then back down to 0.00

 

[Perry Babin]

I was hoping to get something that would indicate that it was one channel causing the protection but I don't see anything. Keep trying to find a manual.